Paragraph 37

If by reason of construction of the specified work the Agency’s access to flood defences or equipment maintained for flood defence purposes is materially obstructed, the undertaker must provide such alternative means of access that will allow the Agency to maintain the flood defence or use the equipment no less effectively than was possible before the obstruction as soon as reasonably practicable and within 24 hours of the undertaker becoming aware of such obstruction unless a longer period of time has been agreed in writing by the Agency.